Re: Retrieving comment of rules and triggers

On Thu, Jun 9, 2016 at 5:01 PM, David G. Johnston <david.g.johnston@gmail.com> wrote:

On Thu, Jun 9, 2016 at 4:45 PM, Alex Magnum <magnum11200@gmail.com> wrote:

Hi, is there a way to retrieve the comment of rules and triggers. I worked it out on functions, tables, views but am kind of stuck with rules and triggers.

​

https://www.postgresql.org/docs/devel/static/functions-info.html

​Table ​9-63. Comment Information Functions

obj_description(object_oid, catalog_name)

Catalog Names:

pg_trigger

pg_rules

The source catalog for the data is:

pg_description

I'm suspect of your existing solution given that this is supposed to be a universal interface for comment data...

David J.

-- To get all rule comments
SELECT DISTINCT r.rulename,
       c.description
  FROM pg_rewrite r
  JOIN pg_description c ON c.objoid = r.oid;

-- To get all trigger comments

SELECT DISTINCT t.tgname,
       c.description
  FROM pg_trigger t
  JOIN pg_description c ON c.objoid = t.oid;


--

Melvin Davidson
I reserve the right to fantasize.  Whether or not you
wish to share my fantasy is entirely up to you.